a, The level of the Mississippi, at its ordinary stage of water. b, The height of the spring rise. c, d, The "dry lakes." By examination of the above drawing, an idea may be formed of the manner of the rises of the Mississippi. The observer will notice that when the water is at a, the lakes c and d will be dry, affording a fine hunting-ground for deer,&c. When the water is at b, the lakes are formed, and arrow-fishing is pursued. (See description.) A correct idea may also be formed by what is meant by a water-line on the trees, indicating the last rise; the water-line will be formed of the sediment settling on the trees at the line b, marked above.